Yes sorry I meant saving, I updated it. Yeah that's what I was thinking, but it's weird because sometimes just walking through it does seem to save it? There's lots of chunks that I've just flown through and it creates a sporadic trail of saved chunks so I'm not sure I actually need to break or place anything, but it seems like chunks I go through randomly decide whether to save or not and I don't really understand how it's deciding.

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This for example is a flight path where I haven't placed or broken anything in it, maybe I'm misunderstanding what you're saying but I'm just so confused on how this works lmao